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Time zonesLive · DST-aware

CST to GMT Converter

See the current time in CST (Chicago) and GMT (Greenwich) side by side, the exact time difference right now, and convert any time between the two zones.

Quick presets

CST to GMT Converter

CST
Chicago
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GMT
Greenwich
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Uses your browser's built-in, DST-aware time-zone data.

ToolFeather · Intl API

About converting CST to GMT

Central Time (Chicago) and Greenwich Mean Time (Greenwich) are in different time zones, so a meeting, call or stream that's convenient in one may be early or late in the other. The clocks above update live and account for daylight saving automatically, so the time difference you see is the real one for today — not a fixed number that goes stale twice a year.

To plan across the two, type a time into the CST box (or tap a quick preset) and read the GMT equivalent, including a "next day" or "previous day" note when the conversion crosses midnight. For any other pair of zones or cities, use the full timezone converter.

CST vs GMT: the time difference through the year

The gap between CST and GMT changes during the year because only one of them uses daylight saving.

PeriodDifference
Oct 23, 2026 – Oct 31, 2026GMT 5 h ahead of CST
Nov 1, 2026 – Mar 13, 2027GMT 6 h ahead of CST
Mar 14, 2027 – Oct 23, 2027GMT 5 h ahead of CST

Daylight-saving changes in the next year

ZoneDateOffsetChange
CSTNov 1, 2026UTC−5 → UTC−6Clocks go back 1 hour
CSTMar 14, 2027UTC−6 → UTC−5Clocks go forward 1 hour
CSTNov 7, 2027UTC−5 → UTC−6Clocks go back 1 hour

CST to GMT conversion table

CSTGMT (when 5 h ahead)GMT (when 6 h ahead)
12:00 AM5:00 AM6:00 AM
1:00 AM6:00 AM7:00 AM
2:00 AM7:00 AM8:00 AM
3:00 AM8:00 AM9:00 AM
4:00 AM9:00 AM10:00 AM
5:00 AM10:00 AM11:00 AM
6:00 AM11:00 AM12:00 PM
7:00 AM12:00 PM1:00 PM
8:00 AM1:00 PM2:00 PM
9:00 AM2:00 PM3:00 PM
10:00 AM3:00 PM4:00 PM
11:00 AM4:00 PM5:00 PM
12:00 PM5:00 PM6:00 PM
1:00 PM6:00 PM7:00 PM
2:00 PM7:00 PM8:00 PM
3:00 PM8:00 PM9:00 PM
4:00 PM9:00 PM10:00 PM
5:00 PM10:00 PM11:00 PM
6:00 PM11:00 PM12:00 AM (next day)
7:00 PM12:00 AM (next day)1:00 AM (next day)
8:00 PM1:00 AM (next day)2:00 AM (next day)
9:00 PM2:00 AM (next day)3:00 AM (next day)
10:00 PM3:00 AM (next day)4:00 AM (next day)
11:00 PM4:00 AM (next day)5:00 AM (next day)

Best time to meet

The two zones

CST · Central Time

Central Time is UTC−6 in winter (CST) and UTC−5 in summer (CDT). It covers Chicago, Dallas, Houston, Mexico City (which no longer uses DST) and Winnipeg. US daylight saving runs from the second Sunday in March to the first Sunday in November.

GMT · Greenwich Mean Time

Greenwich Mean Time is UTC+0 all year. It is the base for world time; the UK uses GMT only in winter and switches to BST in summer.

Frequently asked questions

6 answers
What is the time difference between CST and GMT?
It's shown live at the top of this page (and it can change with daylight saving). The converter uses the current, DST-aware difference between Central Time and Greenwich Mean Time, so the time you see is always right for right now.
How do I convert CST to GMT?
Enter a time in the CST box and the equivalent GMT time appears instantly, adjusted for the current offset between the two zones — including a note if it lands on the previous or next day.
Is this CST to GMT converter accurate with daylight saving?
Yes. It uses your browser's built-in time-zone database (the IANA zones behind Chicago and Greenwich), which tracks daylight-saving changes automatically, so the current times and difference are correct.
What time is it in Greenwich right now?
The live clock above shows the current time in Greenwich (GMT), updating every second, alongside CST.
Does the CST to GMT time difference change?
Yes. Over the next 12 months it is 5 h ahead or 6 h ahead, depending on the date — see the table of periods on this page.
What is a good meeting time for CST and GMT?
Office hours overlap from 9:00 AM to 12:00 PM CST (2:00 PM to 5:00 PM GMT).